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to allow leachate to collect on the liner to a depth exceeding one foot due to the <br />leachate-holding tank being full. <br /> <br />(04) Gas Venting System. Permittee shall conduct active landfill gas venting in <br />accordance with approved plans and shall construct additional phases of the <br />venting system at the time of final cover construction. <br /> <br />(05) Phase IV Water ©ualitv Monitorin~ Work Plan. The Phase IV Water <br />Quality Monitoring Work Plan which describes the sampling frequency, <br />parameters, protocols and reporting frequency for landfill gas, leachate, leachate <br />piezometers, leachate lysimeter, residential wells, groundwater monitoring wells <br />and surface water shall be updated annually to reflect changes in the monitoring <br />systems. The monitoring plan shall yield adequate information for assessing the <br />effectiveness of the landfill gas control system in decreasing VOC contaminants <br />in the groundwater. The ...... ~ ~,~ ~u ~ .........~ ~ ~ b~,~ +~ ~ <br /> <br />(06) Annual Gas Vent System Assessment. Annually assess the effectiveness <br />of active landfill gas venting operations based on the results of groundwater and <br />landfill gas monitoring. Incorporate the evaluation in the MPCA Annual Report <br />for the landfill. <br /> <br />(0z3 07) Heaxa, Metal Contaminant Monitoring, and Assessment. Heavy metal <br />contaminants for surface water and groundwater must be addressed in addition <br />to VOC contaminants. Based on the need for additional monitoring to confirm <br />exceedances and identify trends, the Landfill shall continue monitoring and <br />prepare evaluation reports which shall be submitted with the MPCA Annual <br />Reports. <br /> <br />(4-0 08) Heavy Metal Contamination Feasibility Study. If hea~' metal <br />concentrations in groundwater and surface water exceed regulatow standards, <br /> <br />7 <br /> <br /> <br />